outdoor monster fish tank

Hi its been a month still My 2 iridescent shark 1 albino just 5 inch and 1 black is probably 6 inch they always hiding or to be exact they just stay at the bottom corner of my pond whole day time dont even eat but in night some times they come specially when i feed its an outside pond 7ft x 3ft...

anyone has any experience keeping big tanks outdoors (around 300-500 gallons)? the weather where i'm living is quite tropical so i was wondering if i could use an aquarium chiller to tone the temperature down to around 26 to 27 degrees for my arowana.I know arowanas like to jump so i'm worried...

Okay so I just posted on another thread the possibility of using these nice 5/8" thick tempered glass panels a friend has offered me for free. Each pane is 6' x 4' and I'm aware I'd normally use thicker glass however if stress beams are used in the center between each panel and not one long...